Measuring material relaxation and creep recovery in a microfluidic device

Alison E. Koser, Lichao Pan, Nathan C. Keim, Paulo E. Arratia

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


We present a novel method of testing creep recovery in a microfluidic device. This method allows for the measurement of relaxation time of fluids at low strain. After applying a steady pressure-driven flow along a microchannel, the pressure is released and the fluid is allowed to relax and come to rest. Local strains are observed via the time-dependent velocity profiles and are fit to a general viscoelastic model to obtain the fluids' relaxation times. The use of polymeric solutions of various molecular weights allows for the observation of time scales for strains ranging from 0.01 to 10. Results are consistent with data obtained in a macroscopic rheometer and with a viscoelastic constitutive model.

Original languageEnglish (US)
Pages (from-to)1850-1853
Number of pages4
JournalLab on a Chip
Issue number10
StatePublished - 2013
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • General Chemistry
  • Biomedical Engineering


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